When running on Mac, I get "UTM Coordinate Converter" is damaged and can't be opened
This occurs when running on Mac 10.7 or 10.8 with Gatekeeper set to only allow apps from Mac Store. UTM Coordinate Converter is not distributed through the Mac Store and so Gatekeepers needs to be set to "Anywhere", to allow it run.
For more information about Mac's Gatekeeper, including how to configure the settings refer to: http://support.apple.com/kb/HT5290